stanley



G. E. STANLEY.

SHOCK ABSORBING MECHANISM FOP VEHICLES.

APPLICATION FILED DEC.2I. 191a.

LEGQHQO. lumncd J uly 8, 191%).

2 SHETS--SHEET G. E. STANLEY.

SHOCK ABSORBING MECHANISM FOR VEHICLES.

APPLICATION FILED DEC.2I, 1918.

Patented July 8, 1919.

' 2 snzzrs-sfnzu 2.

PATENT GEORGE ENOCH STANLEY, OF COVENTRY, ENGLAND.

SHOCK-ABSORBING MECHANISM FOR VEHICLE$ Application filed December To all107210???) it may concern:

Be it known that 1, Greece ENoou STAN- Lnr, a subject of the King ofEngland, residing, in Coventry, \Varwickshirc, England, have inventedcertain new and useful Improveinents in Shock-Absorbing Mechanism forVehicles, of which the following is a specification.

This invention relates to improvements in shock-absorbing mechanism oithe type wl'ierein the movement of a cushioning spring which receivesthe shock of the mow ing parts is checked by the employment inconjunction with the latter of a brakii'ig device consisting of aquick-threaded screw on one nioving part and a nut to engage it on theother moving part, these elenioiits being so disposed that the axialmovement of the one causes the rotation of the other against the actionof a brake which checks its rotation to thereby assist in bringing themoving parts to rest before the cushioning spring receives the fullloadimposed by the shock.

In a known construction, the rotating member is gripped endwisc betweenbrakerings, which receive the pressure of the cushioning spring, wherebythe load upon them is progressively increasedas the spring is deformed.Such a construction is liable lac-cause so sudden a check to therotating member and thereby also to the movement of the. cushioned partsas to considerably affect the degree of resiliency they would otherwisepossess, and it is the object oi the present invention to so arrange thebraking device that the retardation obtained by these means shall beapproximately constant throughout the travel of the cushioned parts.

The invention is illustrated in the acconi- Specification 01' LettersPatent.

Patented July 8, till 99.

21, 1918. Serial No. 267,879.

their relative rotation. By this construction the braking action on therotating member is unall'cctcd by the degree of delormation of thecushioning spring, and as the amount ol' thrust on the brake-ring doesnot exceed.

that necessary to overcome the frictional resistance to rotationproduced by its own pressure plus the cndwisc resistance due to theengagement of the scrcwtl1reads, the braking action is approximatelyconstant throughout the travel of the cushioned parts.

The qnick-threaded screw is formed externally upon a rotatable sleeveprovided with an end flange whose outer face is caused to bear against abrake-ring by the endwisc pressure of the nut upon the aforesaidquickthreaded screw.

Referring to lligs, l and 2, A is a clamp for gripping the steeringtube, and B is the upper part of it stayed front fork. 'LJ a spindleprovided with a forked end I) piv oted to the clamp A on pivot studs E;and F is a sleeve carried rotatably on the spindle G and provided atpachend with flanges G, G, one of which is adapted to engage 'lrietionallywith the forked end of the spin dle constituting a brake-ring, and theother with the inside of a cap I-l. carried on the end of the spindle C.A ("up I is ro-' tatably mounted on a bearing J formed on the fare ofthe folk 1), and a cap I: is mounted on the sleeve 1*. opposite to thecap l. The cap K is pivoted to the upper part of the front fork B, and acylindrical helical spring L ai'lapted to be compressed between the twocaps I and K when the fork rocks owing to inequalities in the road. Asecond helical spring M is adapted to be compressed between the insideof the up H and the back of the cap K, on the rel-oil of the fork aftercompressing the spring L.

The rotatable sleeve F is provided with an external square screwr-hrcadof rapid pitch which engages a screw-thremlcd nut N integral with thecap K. The screw-lhreaifl is first formed completely through the nut ionthe fork rocks on its pivot on lhe stoering tube, it rst moves thesleeve F n emlwise {against pressure oi. the spring L; so mm, lllfii noe G engages the annulei' e ol-snriooe o lie hearing J formed on forkedend of the spindle C. l urther screwed sleeve F to folnle as file nnl;I? IS forced along it. This further moveinont al o compresses the springL 11ml thus the movement is cushioned by resistance of il'lf: spring,the friction bo the screwed, sleeve and its nut, and ilie fri'otionlief-ween the flange G and the annularend-surface of the bearing J upon.forked end the spindle C. Similarly on the i coil no movement iscushioned by the lriocion between the flange 4} and mp screwtlireo-zlfriction, and am coinsssion of the oring in; to :Qncl 4:, the externallyii docl pin"; is non-rotatable and the nut 2 engzwes ii by themovementof the cnsliloneil p thereby caused to rotate and in beer enagainst the housing which against it nloromenl muses 'l:

carries it (for example, to boar b'v 37162113 fol radial flanges ortheir eguivnlinto formed upon the nut to ei'igzige corresponding faceson the housing). In CBillf lin types Si'EOCkZEbSOI OBTS this provides amore convenient; arrangement than when oons oroc'ecl with :1nomrotatoble nut and ii rotntslslo s-rew WlllOll ooagcs it A spimlio Aprovided Will forked encl A lay of studs A pivoially conz; clamp whichgrips -inloe. Formed upon the spindle A v Llireacied'nn? engages thescrew A lS rotolzai'ily inounlml in a housing D pro-video with a radialenrl flange The not C is one end provided will: a shoal lor C whichbears against the end of blue housing D and at the other end of ii, is

i lzernally soron threadeil to receive a corresgonclinglyscrew-threaclei'l collar C" which lliiis forms an adjustable shoulder tobear inst, film o llier end of. the housing D Zllms tho slioulcler andcollar C". prevent i use movement of the nut in its lions and l necollar provides for adjustor ronowai of 'alie not C as may be nary.

.11 isl'zioning-spring' of coil form is mounted oi; ono end on thoflange D" and at the and a shoulder A formal oinclle ,5 Toe c ioross'ecllLJEiQWSQEI z:. 13?-; s-::.-.i ono on I anon clz-tlirosileal screw A. Acorrespon(l-,

the ends of the front fork l are connected to it.

A second coil-spring G is mounted in the shook-absorber between the faceof the flange D opposite to that on which the spring E bears, and aflange A carriocl at the outer end of the spindle A The spring G is ilmsadapted to receive llie recoil action of the spring E after fills latterhas been C0111- pressml, The sleeve l) is exienclecl forarclly over thespring G and a cup-shaped memloer H is secured at the end of the spindleA to incloso the spring G and at its open end to slicle 'ielescopioallyovertlie sleeve Di I When the fork F rocks about its pivotal con'neclionto the steering-tube (not shown in the drawing) owing to roadineqimlities or other causes, the sleeve D is moved sncl- WisereletiYsly to the spindle A to cause the cusliioningsprings to act inknown. man nor. Em theisame. time the nut C by its threaded. connectionwith the spindle A is mused to 10$3ilflits housing D and to be thrustenrlyvise' therein so that its shoulder C or ils collar is caused tobesr'friclilO'i'lllly against the endfof the housing D which thus actsas a lira upon it to retard its rotation.

Obviously if desired the recoil spring G may be omitted if the ends ofthe spring" E are anchored to the parts on. which they bear, so. thatthe spring E can be extended as well com-pressed,

Furthermore, desired, the thread A instead of being integral with thespinrlle A spindle A lit will be obvious that shock-absorbers of thistype can lie employed, for other mechanism than. that descrihednndillustrated in the drawing. 'ffl'so "i t is possibl to employ only onespring operating both in tension and compression. For example, thespring L can be connected at one end to the cap I and at the other andto the cap K, and the spring lvl can be dispensed with.

What I claim as my invention and desire to secure by'Lett/ers Patentis:-'

1'. In a shock absorber for the purpose described, the combinocion withtwo relatively movable ports and a cushioning spring intermissedflIGIClh'EIt WQGH, of a quick-threaded screw on one 0:55am movableparts, a not on one other movable port to engage soicl screw, lrwocioifiion GlQXniEl'liiSl'HQllQlll) in conliy the axial movement oftlioone pork,

anal consequent rotation of the other, the one friction element beingconstituted by a flange formed on the one end of the said screw, and theother by the bearing for one of said movable parts.

A construction as specified in claim 1,

in which, in addition t0 said cushioning spring, 11 second cushioningspring is provided to receive the recoil of said first cushioningspring, and a movable nieihber inolos- 10 ing said second cushioningspring.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

GEORGE ENOCH STANLEY.

\Vitnesses Anselm BROWN, N. F. MAL'rnY

